﻿/*************************************************************
 * Software of blackcore
 *
 * CLRVersion:4.0.30319.586
 * MachineName:SPACE
 * Author:Andy Huang
 * Email:itblackhole@gmail.com
 * DateTime：6/25/2013 4:54:39 PM
 * Function：
 *************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace SobFS.Common
{
    public class DESEncryptHelper
    {
        #region ******************************Private Property******************************
        #endregion ******************************Private Property******************************


        #region ******************************Public Property******************************
        #endregion ******************************Public Property******************************


        #region ******************************Structure******************************
        #endregion  ******************************Structure******************************


        #region ******************************Private Method******************************
        #endregion ******************************Private Method******************************


        #region ******************************Public Method******************************
        #region ********************加密********************

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Encrypt(string content)
        {
            return Encrypt(content, SobFSConst.KEY_PASSWORD);
        }
        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Encrypt(string content, string password)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(content);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            return ret.ToString();
        }

        #endregion ********************加密********************

        #region ********************解密********************

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string Decrypt(string content)
        {
            return Decrypt(content, SobFSConst.KEY_PASSWORD);
        }

        /// <summary>
        /// 解密数据
        /// </summary>
        /// <param name="text"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string Decrypt(string content, string password)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = content.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(content.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password, "md5").Substring(0, 8));
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                }
                return Encoding.Default.GetString(ms.ToArray());
            }
        }

        #endregion ********************解密********************

        #endregion ******************************Public Method******************************
    }
}
